bht-fig2.jpgfig2.jpg
Image citation:http://www.advancedaquarist.com/2002/3/chemistry_album/fig2.jpg

Chemical Formula:

Its chemical formula is (CaSO4.~0.5H2O)

Uses:

It is used for: plaster

Effects of too much/too little:

Too much of this can cause CAUSES IRRITATION TO SKIN, EYES AND RESPIRATORY TRACT. MAY BE HARMFUL IF SWALLOWED.
Inhalation:
Causes irritation to the respiratory tract. Symptoms may include coughing, shortness of breath.
Ingestion:
May cause obstruction in stomach, as it hardens with moisture. Symptoms include stomach pain, distress.
Skin Contact:
Causes irritation, redness, pain.
Eye Contact:
Causes irritation, redness, and pain.

Citations:

Info from: http://www.jtbaker.com/msds/englishhtml/c0499.htm